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** Up:** Artley et al.: Equations
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The 2-D system derived by Artley 1992 is a set
of four equations with four unknowns. It can be retrieved by
replacing the vectorial ray parameters with their scalar form
(since the vectors are now in a common plane). The first
relation of system (14) then becomes

| |
(18) |

where *h* is the half offset. The fourth relation becomes
| |
(19) |

and can be simplified to
| |
(20) |

Finally, we obtain the bisection condition as shown by Artley
1992, as follows:
| |
(21) |

** Next:** CONCLUSION
** Up:** Artley et al.: Equations
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Stanford Exploration Project

11/17/1997